Pump anchor



J. N. MARTIN Jan. 14, 1936.

PUMP ANCHOR Filed Aug. 27, 1935 7 1 M v 3/ w 3 h R. 3 6 o w 0 @J 3 W 1 am E 5 iij: in v 0 I n "I N I f: mm": n m mi 1? & ill: tv/ r k\& u N \N Nr a 9% m & a ma 4 4 4 a m ATTORNEYS.

Patented Jan. 14, 1936 PUltIP AN CHOR John N. Martin, Tulsa, Okla.,assignor to Bradford Motor Works, Bradford,- Pa., a corporation ofPennsylvania Application August 27, 1935, Serial No. 38,065

' 17 Claims. (Cl. 166-12) This invention relates to pump anchors v foranchoring pumps in oil wells, and more particularly to anchors suitablefor use with insert pumps in well tubing.

Insert pumps are widely used throughout the world for pumping oil wells.An insert pump, as

- its name implies, is inserted in the well tubing by running it in onthe lower end of the sucker rods,

' but before it can be operated it must be anchored in the tubing sothat the entire pump will not reciprocate with the rods. The generalpractice has been to secure anchoring or seating means on the bottom ofthe string of well tubing before it is lowered into the well. whereflowing wells have ceased flowing so that it becomes necessary to pumpthem, it often happens that no provision has been made for pump seats inthe tubing, and before the wells can be pumped the entire string oftubing must be pulled, provided with seating means, and run back intothe well. This is an expensive and time-consuming operation, especiallywhen the tubing extends several thousand feet into the ground.

In' both of the situations mentioned the seating means is at the bottomof the tubing, which is often at the bottom of the well, and the insertpump can not be seated above that point.

It is often desirable to pump wells at levels above the bottom of thetubing, such as when the oil level in the casing is high so that theexpense of long sucker rods can be saved by pumping at the high level.Likewise, the higher the level at which a well is pumped, the lighterthe load on the entire pumping equipment, thereby giving it longer lifewith fewer breakdowns and making it possible to use smaller and lessexpensive pumping apparatus. It may also-be found desirable to pump thesame well at different times at dif ferent levels.

However, as far as I- know, no practicable anchor for anchoring insertpumps at different levels in a well has ever been put on the market.

' It is among the-objects of this invention to provide a pump anchorwhich is small and compact and complete in itself, which can be set andreset at any level in the well tubing without pulling the tubing orremoving the anchor from the tubing, which securely holds down the pumpwhen set, in which accidentally setting while being raised or lowered issubstantially eliminated and which is manipulated entirely by the suckerrods from the derrick floor.

The invention is illustrated in the accompanying drawing in which Fig. 1is a side view of one embodiment with the parts in the relative posi-However, in oil fields tions they occupy while the anchor is beinglowered in well tubing; Fig. 2 is a side view, partly in section,showing the anchor seated in the well tubing; and Fig. 3 is a side view,partly in section,

of a modified form of the anchor.

Referring to Figs. 1 and 2 of the drawings there is shown a section of astring of well tubing I which is run into a well casing (not shown) inthe usual manner. It is up through this tubing that oil is pumped by aninsert pump secured to a pump anchor} seated in the tubing. The pumpanchor is lowered and raised in the well tubing, and the.reciprocating'member of the pump is reciprocated, by sucker rods (notshown). The reciprocating member slides within predeter- 5 mined limitson a plunger 3 (Fig. 2) threaded in the upper end of a tubular head 4,the lower portion of which is tapered downwardly. This head forms theupper end of the pump anchor.

Rigidly connected to the lower end of the head is an anchor tube 6 onwhich is slidably mounted an expander sleeve I having acylindrical upperportion and a downwardly tapered lower portion. This sleeve is supportedon the anchortube, when the anchor is not set by an annular shoulderformed on the tube, such as by a collar t welded or otherwise rigidlysecured to the tube. The upper end of the sleeve is substantially on alevel with the lower end of head i. Surrounding the tapered portion ofthe head and engaging the upper end of the sleeve is a resilient packingmember 9, preferably made of a compound that does not swell in oil. Thispacking is adapted to be expanded outwardly into sealing engagement withwell tubing l by the wedge efiect produced when the head moves down intothe expander sleeve, as will be set forth in detail hereinafter.

For-anchoring the pump anchor in the well' tubing a plurality ofconventional type expansible toothed slips II are maintained in slidingen- 40 agement with the tapered portion of the expander sleeve byresilient metal strips l2 that are connected at their lower ends to acarrier sleeve l3 slidably mounted on the anchor tube below collar 8.The carrier sleeve is prevented from sliding oil the bottom of theanchor tube by a bottom collar M to the lower end of which a gas anchorcan be connected if necessary, or an insert pump can be secured if it isdesired to pump close to the well bottom instead of above the anchor. I

To hold the slips stationary in the well tubing so that the expandersleeve can slide downward in them and force them radially outward intogripping engagement with the tubing, as shown in Fig. 2, a plurality ofdrag springs l6 are attached at their lower ends to the carrier sleevel3 from which they extend upwardly and outwardly to frictionally engagethe well tubing and tend to prevent the carrier sleeve and slips frommoving downwardly therein. However, it will be understood that exceptwhen the anchor has reached a level in the tubing where it is desired toset the anchor, the carrier sleeve and slips must move downwardly withthe rest of the anchor so that the slips will not be expanded and stopthe anchor. Accordingly, a key I! is rigidly mounted on. the anchor tubein such position that it normally engages the top of the carrier sleeveand moves it downward with the anchor tube and expander sleeve. Topermit the anchor tube to slide down in the carrier sleeve when it is desired that sleeve 1 should expand the slips to set the anchor, thecarrier sleeve is provided with a longitudinal slot [8 for slidably butsnugly receiving the key (Fig. 2) when the anchor tube is turned by thesucker rods to bring the key to the top of the slot.

The sucker rods, by which a pump anchor is lowered, are generallylowered into the well tubing by a cable. Due to the tendency of cablesto twist as they are let out, it frequently happens anchor.

It is a feature of this invention that means have been provided forpreventing such accidental setting or tripping of the anchor to a largeextent. Accordingly, carrier sleeve I3 is provided at one side of slotl8 with an upwardly projecting lug l9 which, when engaged on the sidefarthest from the slot by key I! on the rotating anchor tube, causes thecarrier sleeve to be carried around with the tube so that there is norelative movement between them. This prevents the key from accidentallyreaching the top of the slot from one side, as shown in Fig. 1, but notfrom the opposite side which is kept open to allow the key to enter theslot when the anchor is to be set.

To keep the key from working around the top of the carrier sleeve in theopposite direction and accidentally tripping the'anchor, the upper endof the carrier sleeve is provided with a notch 20 into which key I!projects. The side of this notch farthest from the slot in the carriersleeve is inclined so that the key can be turned around the top of thesleeve to the slot by merely turning the anchor tube, and without firstlifting it to release the key from the notch, which is one of thefeatures of this invention. The inclination of the side of the notch issumcient to. prevent the key from moving up out of the notch of its ownaccord while the anchor is descending.

An additional precaution against accidental tripping of the anchor maybe provided by bending a portion of each drag spring to cause it toextend diagonally or spirally part way around A drag spring of the typeof.

tion only that engages the well tubing, the edge being suitably curvedto conform to the curvature of the tubing. The diagonal portions of thedrag springs all extend in the same direction around the carrier sleevewhich, due to the springs engaging the well tubing at an angle to thevertical, is caused to rotate as it is lowered and to thereby hold lugl9 against the key on the side farthest from the slot.v In some casesthese drag springs may be sufficient to prevent accidental tripping,without the use of notch 20.

The diameters of bottom collar l4 and the cylindrical portion of head 4are substantially the same and are. slightly greater than those ofpacking 9 and the cylindrical portion of the expander sleeve. The reasonfor this is to allow for some stretching of the packing in use withoutits projecting outwardly beyond the head where it might drag against thewell tubing as the anchor is lowered and be pushed up on the head. Whenparafllne conditions exist in the tubing the enlarged bottom collarserves to clean out the tubing in front of the packing and expandersleeve.

The manner in which the pump anchor described above is used will now bedescribed in more detail.

When a well is to be pumped by means of an insert pump, the pump isattached to the upper end of the anchor and both are lowered into thewell tubing by sucker rods until the pump has reached the pumping level,whereupon the anchor is set in order to anchor the pump in thatposition. As the anchor is lowered in the well tubing the parts are inthe position shown in Fig. l with key l'l engaging carrier sleeve I3 innotch 20 so that expander sleeve 1 can not expand the slips against thetubing, and head 4 can not expand the resilient packing.

Ii the anchor tube rotates clockwise, as seen from above, while it isbeing lowered, the key strikes against lug l9 which prevents it fromentering the slot in the carrier sleeve. On the other hand, if theanchor tube rotates in the opposite direction the carrier sleeve againrotates with it because the-key engages the inclined side of notch 20,and because diagonal portions 2| of the drag springs which engage thewell tubing turn the sleeve in a counterclockwise direction, as itdescends in the tubing.w Thus, whichever way the anchor tube rotates,the lug I9 and the key are-held in contact with each other and thepossibility of the key working around the top of the sleeve to the slotand accidentally tripping the anchor before it should be set is veryremote.

When the pumping level is reached the sucker rods are turnedcounterclockwise to move the key around the top of the carrier sleeve tothe top of slot l8. This is done without requiring the anchor tube andkey to be raised to release the key from notch 20, which would makesetting of the anchor in a predetermined position very difiicult. Assoon as the key registers with the slot there is nothing to push thecarrier sleeve further down in thewell tubing against'the resistanceoifered by the frictional engagement of the drag springs with thetubing, but the anchor tube continues to move downwardly in thestationary carrier sleeve. The expander sleeve likewise continues todescend relative to the carrier sleeve until it has expanded or wedgedthe slips radially outward into gripping engagement with the welltubing, as shown in Fig. 2. The setting of the slips halts furthermovement of the expander sleeve, but the weight of the pump and suckerrods on head 4 continues to move it downwardly towards the two sleeves,both of which are now stationary, until the tapered portion of the headhas expanded the resilient packing into sealing engagement with theinner face of the well tubing. The pump anchor is now properly seated inthe tubing.

Due to variations in the internal diameter of well tubing it may happenthat in order for packing 9 to be pressed tightly against the tubing thetapered portion of the head must move downwardly in the expander sleevefor a greater distance at one time than at another. Therefore, toprevent the downward movement of the tapered portion of the head in theexpander sleeve from being prematurely limited by engagement with theinside of the'cylindrical portion of the sleeve, the latter is providedwith a plurality of longitudinal slots 25 extending downwardly from itsupper end. Thus, as shown in-Fig. 2, if the tapered portion of the headengages the expander sleeve before the packing has been sufficientlyexpanded, the upper portion of the expander sleeve is also expanded bythe head.

In order to assist in preventing head i from being raised in the packingby the up-stroke of the insert pump and thereby releasing the packingand slips, the tapered portion of the head is preferably provided with aplurality of circumferential grooves 2twith which the resilient packinginterlocks. The frictional engagement of the packing with the welltubing. and with the tapered portion of the head together with thegripping effect produced by the grooves is sufficient to hold down theanchor against the upward pull exerted on the head on each up-stroke ofthe pump. As will be seen in Fig. 2, the packing is tightly compressedbetween the metal head, the top of sleeve l and the wall of the welltubing. The narrow top of the packing is under the pressure of thecolumn of fluid above it. The top of the expander sleeve forms a rigidsupport for nearly the entire packing. This construction permits thehead to pack down solidly so that there is substantially no relativemovement betweeri the head and packing and between the packing andtubing which would rapidly wear away and break down the packing.

Head 4 may be provided with a plurality of radial openings 25 that arecovered by the packing when the anchor is set, but which are disposedabove the packing when the head is raised to release the packing,whereby fiuid above the packing is permitted to drain through the headand the anchor tube when pulling the pump and anchor from the well forrepairs.

The anchor is released by merely pulling up on the sucker rods whichraise the head sufiiciently to release the packing from the tubing andto pull the expander sleeve up in the slips to likewise release themfrom the tubing, whereby the entire anchor can then be raised or loweredand reset at any other leve1 in the tubing. When the key is pulled outof the top of the slot in the carrier sleeve on releasing the anchor,the rods are turned to move the key around the sleeve to notch 20.

A pump anchor constructed in accordance with this invention can be setand reset at any desired levels in the well tubing without the use of ananchor pipe extending to the bottom of the well .and without pulling thetubing. This results in a great saving in time and money. The anchor issmall, compact and inexpensive. It securely supports and holds down aninsert pump, but it can be quickly released from the well tubing and setat another level therein. While it is being shifted from one position toanother in the tubing the possibility of its being accidentally trippedis very small.

In the modification shown in Fig. 3 the drag springs M are theconventional bow type without diagonal portions engaging the welltubing. To cause carrier sleeve 32 to rotate with anchor tube 33 as thepump anchor is lowered in tubing 34, the upper end of the sleeve isprovided with a key-receiving notch 36 of the same form as notch 20 inFigs. 1 and 2.

One type of positive means for holding down expander sleeve 39 andpacking member. to prevent them from working up on the head while theanchor is being lowered is also shown in Fig. 3. This consists of a coilspring d2 encircling the anchor tube between a shoulder 43 in theexpander sleeve and the lower end of head M. This spring biases the headand expander sleeve away from each other, and as the upper end of thesleeve is provided with a circumferential groove it into which a lip llon the lower end of the packing projects, the packing is likewise biaseddownwardly away from the head. Of course, when the anchor is set thecoil spring is compressed.

Head Ml is frusto-conical' throughout the major portion of its length,thereby leaving but little space between its. upper end and the welltubing into which sand can pack. This embodiment is set and reset in thewell tubing in the same manher as the embodiment first described.

According to the provisions of the patentstatutes, I have explained theconstruction and mode of operation of my invention and have illustratedand described what I now consider to represent its mst embodiment.However, I desire to have it understood that, within the scope 'of theappended claims, the invention may be practiced otherwise than asspecifically illustrated and described.

I claim:

1. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end thereof, aresilient packing surrounding said head, and a sleeve slidably mountedon said tube with its upper end engaging the packing and adapted to beheld stationary in the well tubing while said head moves downwardlyrelative thereto to expand said packing into frictional engagement withsaid tubing, said tapered head being provided with a plurality ofcircumferential grooves into which portions of the expanded packing arecompressed to aid in restraining upward movement of the head in thepacking.

2. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end thereof, aresilient packing surrounding said head, and a sleeve slidably mountedon said tube with its upper end engaging the packing and adapted to beheld stationary in the well tubing while said head moves downwardlyrelative thereto to expand said packing into frictional engagement withsaid tubing, said sleeve being provided with a plurality of slotsextending downwardly from its upper end whereby the sleeve isexpansible.

3. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end thereof, aresilient packing surrounding said head, and a sleeve slidably mountedon said tube with its upper end engaging the packing and adapted to beheld stationary in the well tubing while said head moves downwardlyrelative thereto to expand said packing into frictional engagement withsaid tubing, said sleeve being provided with a plurality of slotsextending downwardly from its upper end whereby the sleeve isexpansible, said tapered head being provided with a plurality ofcircumferential grooves into which portions of the expanded packing arecompressed to aid in restraining upward movement of the head in thepacking.

4. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end thereof, aresilient packing surrounding said head, a sleeve slidably mounted onsaid tube with its upper end engaging the packing, and means for haltingdownward movement of said sleeve in the well tubing whereby to permitsaid head to move downwardly relative thereto to expand said pack inginto frictional engagement with said tubing, said tapered head beingprovided with a plurality of circumferential grooves into which portionsof the expanded packing are compressed to aid in restraining upwardmovement of the head in the packing.

5. A pump anchor for use in well tubing,'comprising an anchor tube, adownwardly tapered tubular head-secured, to the upper end thereof, aresilient packing surrounding said head, a sleeve slidably mounted onsaid tube with its upper end engaging the packing, and means for haltingdownward movement of said sleeve in the well tubing whereby to permitsaid head to move downwardly relative thereto to expand said packinginto frictional engagement with said tubing, said means being renderedoperable by turning 7 said anchor tube without lifting it.

6. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end thereof, aresilient packing surrounding said head, and a sleeve slidably mountedon said tube with its up-f' per end engaging the packing and adapted tobe I bular head secured to the upper end thereof, a

resilient packing surrounding said head, a. downwardly tapered expandersleeve slidably mounted on said tube with its upper end engaging thepacking, a carrier sleeve slidably mounted on the tube below saidexpander sleeve, a plurality of expansible slips slidably disposed onsaid expander sleeve and connected to said carrier sleeve, meansconnected to the carrier sleeve for frictionally engaging the welltubing, means for normally limiting downward movement of the tuberelative to the carrier sleeve, the carrier sleeve being provided with alongitudinal slot for permitting said meansand tube to move downwardlyin the sleeve after the tube is turned therein to bring said means intoregistry with the slot, and means for causing the carrier sleeve torotate with the tube as the pump anchor is lowered in said well tubing.

8. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end of the tube, acollar secured to the lower end of the tube, a resilient packingsurrounding said head and having an outer diameter less than that ofsaid collar and head, a downwardly tapered expander sleeve slidablymounted on said tube with its upper end engaging the packing, expansibleslips slidably disposed on said sleeve, a carrier sleeve slidablymounted on the tube below said expander sleeve, resilient membersconnecting the slips to the carrier sleeve and biasing them radiallyinward, means secured to the carrier sleeve for frictionally engagingthe well tubing, means for normally limiting downward movement of'thetube relative to the carrier sleeve, the carrier sleeve being providedwith a longitudinal slot for permitting said means and tube to movedownwardly in the sleeve after the tube is turned therein to bring saidmeans into registry with the slot, and means for causing the carriersleeve to rotate with the tube as the pump anchor is lowered in saidwell tubing.

9. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end of the tube, aresilient packing surrounding said head, an expander sleeve slidablymounted on said tube and having an upper cylindrical portion engagingsaid packing and a downwardly tapered lower portion, said cylindricalportion being provided with a plurality of slots extending downwardlyfrom its upper end, expansible slips slidably disposed on the taperedportion of said sleeve, a carrier sleeve slidably mounted on the tubebelow said expander sleeve, resilient members connecting the slips tothe carrier sleeve and biasing them radially inward, means secured tothe carrier sleeve for frictionally engaging the well tubing, means fornormally limiting downward movement of the tube relative to the carriersleeve, the carrier sleeve being provided with a longitudinal slot forpermitting said means and tube to move downwardly in the sleeve afterthe tube is turned therein to bring said means into registry with theslot, and means for causing the carrier sleeve to rotate with the tubeas the pump anchor is lowered in said well tubing.

10. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end of the tube andprovided with a plurality of circumferential grooves, a resilientpacking surrounding said head, a downwardly tapered expander sleeveslidably mounted on said tube with its upper end engaging the packing,expansible slips slidably mounted on said sleeve, 9. carrier sleeveslidably disposed on the tube below said expander sleeve, resilientmembers connecting the slips to the carrier sleeve and biasing themradially inward, means secured to the carrier sleeve for frictionallyengaging the well tubing, means for normally limiting downward movementof the tube relative to the carrier sleeve, the carrier sleeve beingprovided with a longitudinal slot for permitting said means and tube tomove downwardly in the sleeve after the tube is turned therein to bringsaid means into registry with the slot, and means for rotating thecarrier sleeve with the tube as. the pump anchor is lowered in said welltubing,

11. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly taperd tubular head secured to the upper end thereof, aresilient packing surrounding said head, a downwardly tapered expandersleeve slidably mounted on said tube with its upper end engaging thepacking, a carrier sleeve slidably mounted on the tube below saidexpander sleeve, a plurality of expansible slips slidably disposed onsaid expander sleeve and connected to said carrier sleeve, meansconnected to the carrier sleeve for frictionally engaging the welltubing, means for normally limiting downward movement of the tuberelative to the carrier sleeve, the carrier sleeve being provided with alongitudinal slot for permitting said means and tube to move downwardlyin the sleeve after the tube is turned therein to bring said means intoregistry with the slot, means for rotat ing the expander sleeve with thetube as the pump is lowered into said well tubing, and means forpositively holding said packing on the lower portion of said head duringsaid lowering of the pump.

12. A pump anchor for use in well tubing, comprising an anchor tube, adownwardly tapered tubular head secured to the upper end of the tube, aresilient packing surrounding said head, a downwardly tapered expandersleeve slidably mounted on said tube and being provided with an internalshoulder, the upper end of said sleeve and the lower end of the packingbeing formed for interlocking engagement, a coil spring encircling saidtube in said sleeve and compressed between the lower end of said headand said shoulder, expansible slips slidably disposed on said sleeve, acarrier sleeve slidably mounted on the tube below said expander sleeve,resilient members connecting the slips to the carrier sleeve and biasingthem radially inw'ard, means secured to the carrier sleeve forfrictionally engaging the well tubing, means for normally limitingdownward movement of the tube relative to the carrier sleeve, thecarrier sleeve being provided with a longitudinal slot for permittingsaid means and tube to move downwardly in the sleeve after the tube isturned therein to bring said means into registry with the slot, andmeans for rotating the carrier sleeve with the tube as the pump anchoris lowered in said well tubing.

13. A pump anchor for use in well tubing, comprising an anchor tube, acarrier sleeve slidably mounted thereon, a plurality of expansible slipssurrounding the tube and connected to the carrier sleeve, means securedto the carrier sleeve for frictionally engaging the well tubing, meansfor normally limiting downward movement of the tube relative to thecarrier sleeve, the carrier sleeve being provided with a longitudinalslot for permitting said means and tube to move downwardly in the sleeveafter the tube is turned therein .to bring said means into registry withthe slot, means for expanding said slips into gripping engagement withthe well tubing when said tube moves downwardlyin the sleeve, and meansfor causing the carrier sleeve to rotate with the tube as the pumpanchor is lowered in said well tubing.

14. A pump anchor for use in well tubing, comprising an anchor tube, acarrier sleeve slidably mounted thereon, aplurality of expansible slipssurrounding the tube and connected to the carrier sleeve, means securedto the carrier sleeve for frictionally engaging the well tubing, a keyprojecting from said tube above the carrier sleeve for normally limitingdownward movement of the tube relative to said sleeve, the carriersleeve being provided with a longitudinal slot for receiving said keywhen the tube is turned in' said sleeve to bring the key into registrywith the slot whereby the tube and key are permitted to move downwardlyin the carrier sleeve, a resilient packing, means for expanding saidslips and packing into sealing engagement with the well tubing when saidtube moves downwardly in the sleeve,

and means for causing the carrier sleeve to rotate with the tube as thepump anchor is lowered in said well tubing.

15. A pump anchor for use in well tubing, comprising an anchor tube, acarrier sleeve slidably mounted thereon, a plurality of expansible slipssurrounding the tube and connected to the carrier sleeve, a plurality ofdrag springs'securecl to the carrier sleeve for frictionally engagingthe well tubing, means for normally limiting down ward movement of thetube relative to the carrier sleeve, the carrier sleeve being providedwith a longitudinal slot for permitting said means and tube to movedownwardly in the sleeve after the tube is turned therein to bring saidmeans into registry with the slot, and means for expanding said slipsinto gripping engagement with the well tubing when said tube movesdownwardly in the sleeve, the tubing-engaging portions of said dragsprings extending diagonally of the anchor tube whereby the carriersleeve is caused to rotate in the well tubing with said anchor tube inone direction as the pump anchor is lowered in the tubing, and thecarrier sleeve being provided with an upwardly projecting portionadapted to be engaged by said means to thereby cause the carrier sleeveto rotate with the anchor tube in the other direction.

16. A pump anchor for use in well tubing, comprising an anchor tube, acarrier sleeve slidably mounted thereon, a plurality of expansible slipssurrounding the tube and connected to the carrier sleeve, a plurality ofdrag springs secured to the carrier sleeve for frictionally engaging thewell tubing, a key projecting from said tube above the carrier sleevefor limiting downward movement of the tube relative to said, sleeve, thecarrier sleeve being provided with a longitudinal slot for receivingsaid key when the tube is turned in said sleeve to bring the key intoregistry with 40 the slot to thereby permit the tube and key to movedownwardly in the carrier sleeve, and means for expanding said slipsinto gripping engagement with the well tubing when said tube movesdownwardly in thesleeve, the upper end 45 of the carrier sleeve beingprovided with a notch adapted to receive said key whereby to cause thecarrier sleeve to rotate with the anchor tube as the carrier sleeve forlimiting downward move-- ment of the tube relative to said sleeve, thecarrier sleeve being providedwith a longitudinal slot for receiving saidkey when the tube is turned in said sleeve to bring the keyinto registrywith the slot to thereby permit the tube and key to move downwardly inthe carrier sleeve, and means for expanding said slips into grippingengagement with the well tubing when said tube moves downwardly in thesleeve, the upper end of the carrier sleeve being provided with a notchadapted to receive said key whereby to cause the carrier sleeve torotate with the anchor tube as they are lowered in the well tubing, andone side of said notch extending spirally upward to the top of thecarrier sleeve.

JOHN N. MARTIN.

